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arm-asm: Add ldrex, ldrexb, strex, strexb

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Danny Milosavljevic 2021-01-05 00:20:16 +01:00 committed by Ramsay Jones
parent 54ef167111
commit 483625065f
2 changed files with 69 additions and 2 deletions
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67
arm-asm.c
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@ -939,10 +939,11 @@ static void asm_long_multiplication_opcode(TCCState *s1, int token)
static void asm_single_data_transfer_opcode(TCCState *s1, int token)
{
Operand ops[3];
Operand strex_operand;
int exclam = 0;
int closed_bracket = 0;
int op2_minus = 0;
uint32_t opcode = 1 << 26;
uint32_t opcode = 0;
// Note: ldr r0, [r4, #4] ; simple offset: r0 = *(int*)(r4+4); r4 unchanged
// Note: ldr r0, [r4, #4]! ; pre-indexed: r0 = *(int*)(r4+4); r4 = r4+4
// Note: ldr r0, [r4], #4 ; post-indexed: r0 = *(int*)(r4+0); r4 = r4+4
@ -955,9 +956,25 @@ static void asm_single_data_transfer_opcode(TCCState *s1, int token)
return;
}
if (tok != ',')
expect("two arguments");
expect("at least two arguments");
else
next(); // skip ','
switch (ARM_INSTRUCTION_GROUP(token)) {
case TOK_ASM_strexbeq:
case TOK_ASM_strexeq:
parse_operand(s1, &strex_operand);
if (strex_operand.type != OP_REG32) {
expect("register");
return;
}
if (tok != ',')
expect("at least three arguments");
else
next(); // skip ','
break;
}
if (tok != '[')
expect("'['");
else
@ -1039,6 +1056,7 @@ static void asm_single_data_transfer_opcode(TCCState *s1, int token)
opcode |= 1 << 22; // B
/* fallthrough */
case TOK_ASM_streq:
opcode |= 1 << 26; // Load/Store
asm_emit_opcode(token, opcode);
break;
case TOK_ASM_ldrbeq:
@ -1046,6 +1064,47 @@ static void asm_single_data_transfer_opcode(TCCState *s1, int token)
/* fallthrough */
case TOK_ASM_ldreq:
opcode |= 1 << 20; // L
opcode |= 1 << 26; // Load/Store
asm_emit_opcode(token, opcode);
break;
case TOK_ASM_strexbeq:
opcode |= 1 << 22; // B
/* fallthrough */
case TOK_ASM_strexeq:
if (opcode & 0xFFF) {
tcc_error("offset not allowed with 'strex'");
return;
} else if (opcode & ENCODE_IMMEDIATE_FLAG) { // if set, it means it's NOT immediate
tcc_error("offset not allowed with 'strex'");
return;
}
if ((opcode & (1 << 24)) == 0) { // add offset after transfer
tcc_error("adding offset after transfer not allowed with 'strex'");
return;
}
opcode |= 0xf90;
opcode |= strex_operand.reg;
asm_emit_opcode(token, opcode);
break;
case TOK_ASM_ldrexbeq:
opcode |= 1 << 22; // B
/* fallthrough */
case TOK_ASM_ldrexeq:
if (opcode & 0xFFF) {
tcc_error("offset not allowed with 'ldrex'");
return;
} else if (opcode & ENCODE_IMMEDIATE_FLAG) { // if set, it means it's NOT immediate
tcc_error("offset not allowed with 'ldrex'");
return;
}
if ((opcode & (1 << 24)) == 0) { // add offset after transfer
tcc_error("adding offset after transfer not allowed with 'ldrex'");
return;
}
opcode |= 1 << 20; // L
opcode |= 0x00f;
opcode |= 0xf90;
asm_emit_opcode(token, opcode);
break;
default:
@ -1163,6 +1222,10 @@ ST_FUNC void asm_opcode(TCCState *s1, int token)
case TOK_ASM_ldrbeq:
case TOK_ASM_streq:
case TOK_ASM_strbeq:
case TOK_ASM_ldrexeq:
case TOK_ASM_ldrexbeq:
case TOK_ASM_strexeq:
case TOK_ASM_strexbeq:
return asm_single_data_transfer_opcode(s1, token);
case TOK_ASM_andeq:

4
arm-tok.h
View File

@ -93,6 +93,10 @@
DEF_ASM_CONDED(ldrb)
DEF_ASM_CONDED(str)
DEF_ASM_CONDED(strb)
DEF_ASM_CONDED(ldrex)
DEF_ASM_CONDED(ldrexb)
DEF_ASM_CONDED(strex)
DEF_ASM_CONDED(strexb)
DEF_ASM_CONDED(stmda)
DEF_ASM_CONDED(ldmda)